Recent publications

May 2025

Inter-hospital transferability of AI: A case study on phase recognition in cholecystectomy

Lasse Renz-Kiefel, Peter Eisert, Anna Hilsmann, Eric Wisotzky, sebastian Lünse, Rene Mantke

Identifying surgical phases is a crucial component of surgical workflow analysis, facilitating the automated evaluation of surgical procedures’ performance and efficiency. A significant challenge in developing neural networks for surgical phase...


May 2025

Realtime-Rendering of Dynamic Scenes with Neural Radiance Fields

Kilian Leonard Krause, Peter Eisert, Anna Hilsmann, Wieland Morgenstern

This paper addresses the challenge of real-time rendering of dynamic 3D scenes using Instant Neural Graphics Primitives (iNGP), training a separate radiance field for each frame. To enable interactive VR playback, efficient data storage and...


May 2025

Experimental demonstration of robust spatial-diversity combining for coherent free-space optical transmission

Abraham Johst, Lutz Molle, Michael Rohde, Ronald Freund, Markus Nölle, Nicolas Perlot

Spatial-diversity schemes are applied to improve signal quality of coherent free-space optical transmission systems with uncorrelated phase noise. We compare the performance of conventional schemes (MRC, SDC) to a newly proposed one (X-MRC).


May 2025

Space-Division Multiplexed Transmission from the Lab to the Field

C. Antonelli, A. Mecozzi, Colja Schubert, L.K. Oxenløwe, A. Carena, Robert Emmerich, Georg Rademacher, Nicolas Fontaine, Giammarco Di Sciullo, Andrea Marotta, Fabio Graziosi, Takuji Nagashima, Alberto Gatto, Paola Parolari, Pierre Sillard, Roland Ryf, Lauren Dallachiesa, R.S. Luis, D. A. Shaji, D. Ri-bezzo, M. Mazur, T. Nakanishi, D. Bacco, A. Zavatta, M. Zahidy, D. Orsuti, M. Fasano, P. Boffi, N. Sambo, A. Nespola, S. Guerrier, C. Dorize, J. Renaudier, N. Hoghooghi, F. Quinlan, Qi Wu

Researchers from the University of L’Aquila, NICT, Finisar, Prysmian, Nokia Bell Lab and Fraunhofer HHI Space-Division Multiplexed Transmission technologies from the Lab to the Field and present a summary for their work in this invited...


May 2025

Timebin-Phase BB84 Quantum Key Distribution Using Telecom-Wavelength Fiber-Coupled SPADs

Jan Krause, Patrick Runge, Martin Schell, Ronald Freund, Nino Walenta, Pascal Rustige

Single-photon avalanche detectors (SPADs), which operate without cryogenic cooling, are a core component for practical QKD systems. We demonstrate 13-hour continuous key generation with our timebin-phase BB84 QKD system using our InGaAs/InP SPAD,...


May 2025

A Flexible Real-Time Quantum Key Distribution System for Fiber and Free-Space Links

Jan Krause, Ronald Freund, Jonas Hilt, Nino Walenta

To enable QKD in various scenarios, we developed a 625 MHz real-time autonomous timebin-phase QKD system with custom clock synchronization. We demonstrate the system’s performance and robustness under unstable link conditions, a variety of fiber...


May 2025

Single-Carrier 2.56 Tb/s (3-mode x 128-GBd x DP-16QAM) Transmission over a 53.7 km Few Mode Fiber

Nicolas Braig-Christophersen, Colja Schubert, Carsten Schmidt-Langhorst, Ronald Freund, Robert Emmerich, Fabian Chowanek, Georg Rademacher, Hideaki Furukawa, Aymeric Arnould, Benjamin J. Puttnam, Kazuhiko Aikawa, Juan Carlos Alvarado Zacarias, Rodrigo Amezuca-Correa, Ruby S. B. Ospina

We investigate high-symbol rate SDM transmission using 16 to 128 GBd QPSK, 16-QAM and 64-QAM modulation over a 3-mode fiber. An aggregated net rate of 2.56 Tb/s was obtained after 54 km transmission using 128 GBd 16-QAM signals.


May 2025

Clock offset synchronization with sublinear complexity for quantum key distribution on low-level hardware

Jan Krause, Ronald Freund, Jonas Hilt, Nino Walenta

We introduce iQSync, a clock-offset recovery method for quantum key distribution. iQSync achieves sub-linear computational complexity, allowing for the implementation on low-level hardware. We demonstrate the method for channel attenuations...


May 2025

Monolithic InP Ring Resonator based Laser with 40 kHz Linewidth and 40 nm Tuning Range

Hendrik Boerma, Patrick Runge, Martin Schell, Arbnor Berisha, Daniel Haubenreißer

A narrow linewidth tunable laser based on ring resonators is presented. It uses low loss passive waveguides implemented in a monolithic InP photonic integrated circuit. The laser can be tuned over a wavelength range from 1559 nm to 1602 nm. The...


April 2025

3DGS.zip: A survey on 3D Gaussian Splatting Compression Methods

Milena Teresa Bagdasarian, Mario Goldenbaum, Peter Eisert, Anna Hilsmann, Wieland Morgenstern, Florian Tim Barthel, Paul Knoll, Yi-Hsin Li

3D Gaussian Splatting (3DGS) is a powerful technique for real-time radiance field rendering but is limited by its high storage and memory requirements. This survey provides the first comprehensive analysis of existing compression and compaction...


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